[PATCH 5/6] cpufreq: Add down_differential tunable

[Youquan Song]

Add down_differential tuable for user adjust ondemand governor decrease
frequency threshold. down_differential is used in original ondemand governor
code, but it does not add it as tunable, so I add it as tunable in this patch 

Signed-off-by: Youquan Song <youquan.song@xxxxxxxxx>
---
 drivers/cpufreq/cpufreq_ondemand.c |   26 ++++++++++++++++++++++++++
 1 files changed, 26 insertions(+), 0 deletions(-)

diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
index 5dd3770..85ca136 100644
--- a/drivers/cpufreq/cpufreq_ondemand.c
+++ b/drivers/cpufreq/cpufreq_ondemand.c
@@ -292,6 +292,7 @@ static ssize_t show_##file_name						\
 show_one(sampling_rate, sampling_rate);
 show_one(io_is_busy, io_is_busy);
 show_one(up_threshold, up_threshold);
+show_one(down_differential, down_differential);
 show_one(sampling_down_factor, sampling_down_factor);
 show_one(ignore_nice_load, ignore_nice);
 show_one(powersave_bias, powersave_bias);
@@ -513,9 +514,33 @@ static ssize_t store_window_is_dynamic(struct kobject *a, struct attribute *b,
 	return count;
 }
 
+static ssize_t store_down_differential(struct kobject *a, struct attribute *b,
+				    const char *buf, size_t count)
+{
+	unsigned int input;
+	int ret;
+	ret = sscanf(buf, "%u", &input);
+
+	if (ret != 1)
+		return -EINVAL;
+
+	if (input > 30)
+		input = 30;
+
+	if (input < 0)
+		input = 0;
+
+	mutex_lock(&dbs_mutex);
+	dbs_tuners_ins.down_differential = input;
+	mutex_unlock(&dbs_mutex);
+
+	return count;
+}
+
 define_one_global_rw(sampling_rate);
 define_one_global_rw(io_is_busy);
 define_one_global_rw(up_threshold);
+define_one_global_rw(down_differential);
 define_one_global_rw(sampling_down_factor);
 define_one_global_rw(ignore_nice_load);
 define_one_global_rw(powersave_bias);
@@ -527,6 +552,7 @@ static struct attribute *dbs_attributes[] = {
 	&sampling_rate_min.attr,
 	&sampling_rate.attr,
 	&up_threshold.attr,
+	&down_differential.attr,
 	&sampling_down_factor.attr,
 	&ignore_nice_load.attr,
 	&powersave_bias.attr,
-- 
1.6.4.2

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